<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 提示条幅 -->
			<el-alert title="添加商品信息" type="info" center show-icon :closable="false">
			</el-alert>

			<!-- 步骤条 -->
			<el-steps :active="+active" finish-status="success" align-center>
				<el-step title="基本信息"></el-step>
				<el-step title="商品参数"></el-step>
				<el-step title="商品属性"></el-step>
				<el-step title="商品图片"></el-step>
				<el-step title="商品内容"></el-step>
				<el-step title="完成"></el-step>
			</el-steps>

			<!-- Tab 标签页 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
				<el-tabs v-model="active" tab-position="left" @tab-click="handleClick" :before-leave="tabBeforeLeave">
					<el-tab-pane label="基本信息" name="0">
						<el-form-item label="商品名称" prop="goods_name">
							<el-input v-model="addForm.goods_name"></el-input>
						</el-form-item>
						<el-form-item label="商品价格" prop="goods_price">
							<el-input v-model="addForm.goods_price" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品重量" prop="goods_weight">
							<el-input v-model="addForm.goods_weight" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品数量" prop="goods_number">
							<el-input v-model="addForm.goods_number" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品分类" prop="goods_cat">
							<el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品参数" name="1">
						<el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
							<el-checkbox-group v-model="item.attr_vals">
								<el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
							</el-checkbox-group>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品属性" name="2">
						<el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
							<el-input v-model="item.attr_vals"></el-input>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品图片" name="3">
						<!-- action属性：图片上传的后台api接口地址 -->
						<el-upload :headers="headersObj" :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" :on-success="handleSuccess" list-type="picture">
							<el-button size="small" type="primary">点击上传</el-button>
						</el-upload>
					</el-tab-pane>
					<el-tab-pane label="商品内容" name="4">
						<!-- 富文本编辑器 -->
						<quill-editor v-model="addForm.goods_introduce"></quill-editor>
						<!-- 添加商品按钮 -->
						<el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
					</el-tab-pane>
				</el-tabs>
			</el-form>

		</el-card>

		<!-- 图片预览对话框 -->
		<el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
			<img :src="previewPath" alt="烂接口又踏马崩了">
		</el-dialog>
	</div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      active: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 1,
        goods_weight: 1,
        goods_number: 1,
        // 级联选择框选中商品分类的 id 值数组
        goods_cat: [],
        // 上传的图片临时路径
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        // 商品的参数
        attrs: []
      },
      // 添加商品表单的验证规则对象
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 商品分类列表数据
      cateList: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableDate: [],
      // 静态属性列表数据
      onlyTableDate: [],
      // 上传图片的 url 服务器地址
      uploadURL: 'http://139.9.202.95:8888/api/private/v1/upload',
      // 上传组件的 headers 请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 控制图片预览对话框的展示与隐藏
      previewVisible: false,
      // 即将要预览的图片地址
      previewPath: ''
    }
  },
  created() {
    this.getGoodsCate()
  },
  methods: {
    // tab 标签页切换时触发
    async handleClick() {
      // 满足条件 则访问的是动态参数面板
      if (this.active === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数失败！')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        })
        this.manyTableDate = res.data
        // console.log(this.manyTableDate)
      } else if (this.active === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取静态属性失败！')
        this.onlyTableDate = res.data
      }
    },
    // 级联选择器选择项发生变化时触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        return
      }
    },
    // 获取商品分类列表
    async getGoodsCate() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
      this.cateList = res.data
    },
    // 监听 tab 切换之前的钩子
    tabBeforeLeave(activeName, oldActiveName) {
      // console.log(activeName, oldActiveName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.warning('请先选择商品分类！')
        return false
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      // file: 即将要预览的图片信息
      const picUrl = file.response.data.url
      this.previewPath = picUrl
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // file 是将要被移除的 picInfo 图片信息对象
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从 pics 数组中找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      if (i !== -1) {
        this.addForm.pics.splice(i, 1)
      }
    },
    // 图片上传成功时的钩子
    handleSuccess(response) {
      // response；图片上传成功后服务器响应回来的图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项！')

        // 执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableDate.forEach(item => {
          const attrInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(',') }
          form.attrs.push(attrInfo)
        })
        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const attrInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          form.attrs.push(attrInfo)
        })
        // 烂接口，无奈之举
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
        // 发起添加商品数据请求
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status === 201) return this.$message.error(res.meta.msg)
      })
    }
  },
  computed: {
    // 当前选中的商品分类 id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
	margin: 0 10px 0 0 !important;
}
.btnAdd {
	margin-top: 15px;
}
</style>
